General

QUALIFY Clause in Oracle – Alternative

If you are migrating from Teradata to Oracle or Redshift, you will notice that QUALIFY clause is not available. The feature such as QUALIFY clause is widely used in Teradata. But, the same feature is not available in Oracle. In this article, we will check what is QUALIFY Clause alternative in Oracle. QUALIFY Clause in Oracle The relational databases such as Teradata uses QUALIFY clause to filter the result of ordered analytical function. The Oracle database does not support this feature yet. But, when you are migrating Teradata scripts to…

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May 19, 2022
General

How to Load Spark DataFrame to Oracle Table – Example

In my previous post Steps to Connect Oracle Database from Spark, I have explained how to connect to Oracle and query tables from the database. But in some cases, you may get requirement to load Spark dataFrame to Oracle table. We can also use JDBC to write data from a Spark dataframe to database tables. In the subsequent sections, we will explore method to write Spark dataframe to Oracle Table. Load Spark DataFrame to Oracle Table As mentioned in the previous section, we can use JDBC driver to write dataframe…

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July 9, 2020
BigData

Steps to Import Oracle Tables using Sqoop

Oracle database is one of the largely used database in the world. Most of financial organizations are using Oracle for their transaction processing. As mentioned in my other post import Netezza tables using Apache Sqoop, with growing data organizations are moving their computation part to Hadoop ecosystem. In this post, we will check steps to import Oracle tables using Sqoop commands. Steps to Import Oracle Tables using Sqoop Most of the organizations and people trying to get data into Hadoop ecosystem, they use various options such as creating flat-files and…

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March 12, 2019
Apache Spark

Steps to Connect Oracle Database from Spark – Examples

Apache Spark is one of the emerging bigdata technology, thanks to its fast and in memory distributed computation. You can analyze petabytes of data using the Apache Spark in memory distributed computation. In this article, we will check one of methods to connect Oracle database from Spark program. Preferably, we will use Scala to read Oracle tables. You can even execute queries and create Spark dataFrame. Steps to Connect Oracle Database from Spark Oracle database is one of the widely used databases in world. Almost all companies use Oracle as…

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March 5, 2019